Tubing hangers



March 5, L. L. RECTOR TUBING HANGERS Filed June 50, 1958 s Sheets-Sheet 1 INVENTOR Laurence L. Rector ATTORNEYS L. L. RECTOR TUBING HANGERS March 5, 1963 5 Sheets-Sheet 2 Filed June 30. 1958 INVENTOR Laurence L. Rector O ATTORNEYS L. L. RECTOR TUBING HANGERS March 5, 1963 3 Sheets-Sheet 3 Filed June 50. 1958 INVENTOR Laurence L. Re cfor ATTORNEYS United States Patent 3,080,180 TUBING HANGERS Laurence L. Rector, Fort Worth, Tex., assignor to Rector Well Equipment Company, Inc., Fort Worth, Tex., a corporation of Texas Filed June 30, 1958, Ser. No. 745,610 4 Claims. (Cl. 285-137) This invention has to do with apparatus for suspending a plurality of strings of tubing in a tubing head disposed at the top of an oil or gas Well, and has particular application to that type of multiple string suspension devices wherein the hanpers for suspending the tubing may be separately inserted and removed from the tubing head, and are made in complementary shapes, and are of such size so that gas lift valves and other protuberances on the tubing string may be inserted or removed through one of the passages provided upon removal of one of the hangers, without removing the other hangers. A typical example of such a tubing hanger assembly is that disclosed in Allen Patent No. 2,794,505, issued June 4, 1957, entitled, Pipe Hanging Apparatus.

A problem presented in such multiple hanger installations has been the fact that no satisfactory means has been heretofore provided for engaging and holding back one of the hangers when the other hanger is removed, to prevent the hanger remaining in the head from tilting in the head or becoming disengaged from the head to the extent as to obstruct the passage through the head, to thereby prevent the running of a string of tubing through the head and the setting of another hanger adjacent to the hanger remaining in the head.

As shown in the Allen patent, referred to above, and like devices, it ha been the practice to provide diametrically opposed pins in the wall of the heads engageable with vertical slots in the edges of the hangers, or to provide dove-tailed shoulders on the hangers and in the head to prevent the hangers from rotating or moving laterally when one of the hangers is removed.

Such arrangement has been unsatisfactory because of the fact that pins are inherently weak and are often broken or distorted to allow the hanger bodie to move laterally or rotate, and the dove-tailed shoulder arrangement did not provide a secure attachment to prevent the hangers from rotating or moving laterally out of position.

This invention is intended to provide a means for positively holding the hanger bodies against lateral or rotational movement, both when all of the bodies are disposed in the head or when one of the bodies is removed from the head.

In accomplishing this purpose a removable partition is provided in the head providing a wall extending between the faces of the hangers which distributes the lateral rotational force of the hanger across the inner face thereof, so as to eliminate any tendency of one of the hangers to tilt or move laterally in the head when the other hanger is removed.

The partition may take the form of a bowl divided into complementary shaped passages by partitions, which is slidably disposed in the head and rests on a shoulder therein, or it may take the form of a transverse partition extending across the head and removably resting on a shoulder in the head and held against rotation by screws extending through the wall of the head.

In either form the partition is of sufficient height as to eliminate any tendency of one of the hangers to tilt when the others are removed, and distributes the force exerted by the tendency of the hanger to rotate or move laterally, thereby supporting the hangers against lateral and rotational movement.

It is therefore a primary object of this invention to provide means for positively securing complementary tubing hangers within a tubing head against lateral and rotational movement. Another object of the invention is to provide a bowl insertable in a tubing head and removable therefrom, having a central transverse partition therein, dividing the bowl into equal semicircular halves, which partition prevent-s lateral or rotational movement of tubing hangers disposed on opposite sides thereof.

Another object is to provide such a bowl which is guided into place on a locator screw extending through the wall of the head, to a predetermined position, there by providing an accurate and positive guide for setting tubing hangers therein, and permitting the accurate and predetermined positioning of the hangers with relation to the well head assembly.

-A still further object of the invention is to provide a bowl of the character indicated, which accurately guides and positions the hangers within the head, so that hangers can be landed on a substantially square shoulder in the head, thereby permitting the packing rings between the hangers and the head, positioned above the shoulder, to be guided into abutting and sealed relationship, which was not possible in heads wherein the hangers were landed on tapered surfaces in the head.

Another object of this invention is to provide such a bowl which is guided into a predetermined position in the head by a locator screw, which enters a vertical slot in the wall of the bowl, so that other slots in the wall of the bowl will coincide with holddown pin passages through the wall of the head, so that the holddown pin-s may be inserted into recesses or a groove in the hangers after they have been positioned in the head, to hold the hangers against movement by pressure from below.

A general object of the invention is to provide a hanger positioning and retaining bowl or partition which may be easily inserted and removed and which may be quickly interchanged for use in other heads.

Other and further objects of the invention will become apparent upon reading the detailed specification herein-- after following, and by referring to the drawings annexed hereto.

In the drawings suitable embodiments of the invention are dis-closed, it being understood that other and further modifications and embodiment of the invention may be made, and that the drawings are merely illustrative of preferred forms for carrying out my invention.

In the drawings:

FIGURE I is a cross-sectional, elevational view of a typical multiple tubing head assembly showing dual hangers suspended in .the tubing head and incorporating the improvement described and claimed herein.

FIGURE II is a perspective view of the preferred form of supporting and suspending bowl and a tubing hanger which is insertable in one semicircular passage through the bowl.

FIGURE III is a top plan view with a sectionalized view of one tubing hanger inserted in a semicircular passage in the hanger bowl, and showing a typical holddown screw extending through the tubing head wall and into a recess provided in the wall of the tubing hanger.

FIGURE IV is a fragmentary cross sectional, elevational view of a tubing head assembly with dual hangers suspended therein, and showing a modified form of hanger bowl.

FIGURE V is a top plan view of the modified form of hanger bowl, showing a sectionalized tubing hanger disposed in one semi-circular passage in the bowl, and showing a holddown screw extending through the wall of the tubing head and into a recess in the wall of the hanger.

FIGURE VI is a perspective view showing the modified hanger bowl and a modified tubing hanger which is insertable in one semicircular half of the bowl.

FIGURE VII is a cross-sectional elevational view of a tubing head having tubing hangers suspended therein and showing a form of partition extending across the head between hangers to support the hangers against rotational and lateral movement.

' FIGURE VIII is a perspective view of the modified partition and a pair of modified tubing hangers which are complementary to the walls of the partition.

FIGURE IX is a fragmentary transverse sectional view showing a typical guide pin extending through the wall of the tubing head and into the guide slots at each end of the partition, to hold the partition against rotational and lateral movement.

Numeral references are employed to designate the various parts of the device as shown in the drawings, and like numerals indicate like parts throughout the various figures of the drawings.

The numeral 1 indicates a tubing head which is normally secured to a casing head (not shown) at the lower end thereof.

The tubing head 1 has a central bore 2 therethrough, which usually communicates with the casing annulus between the tubing strings extending into the casing and the well casing.

The tubing head 1 has an enlarged annular flange 3 extending about the upper side thereof to which may be sealingly secured a sealing flange 4, which is surmounted by an adaptor flange 5. The adaptor flange may be secured to suitable well head control equipment (not shown).

The head flange 3 and the sealing flange 4 are drawn and held together by conventional studs 6, and the adaptor flange 5 is secured to the sealing flange 4 by means of the studs 7. Before drawing the respective flanges together conventional metal seal rings 8 and 11 are disposedin the grooves 9 and 10 and 12 and 13 on the respective faces of the flanges, and when such flanges are drawn together by the studs, such metal seal rings are compressed and form a seal between the respective flanges.

Test ports 4b are provided through the sealing flange 4 to test the seals above and below the ports.

The sealing flange 4 includes a central web portion 4a, which forms adjacent circular passages 14 and 15 through such flange.

The adaptor flange 5 has formed therein the interiorly threaded openings 16 and 17 which coincide with the passages 49 through the hangers 3-7, hereinafter described. A surface connection pipe 18 may be threadedly connected in each. of the passages 16 and 17; The pipe 18 may be connected to suitable surface control equipment (not shown) and therethrough to storage tanks or flow lines.

A bowl, generally indicated at 19, is slidably and re movably inserted in the bore 2 of the tubing head 1.

The bowl, as most clearly shown in FIGURE II, comprises a circular wall 23' which is divided into two equal semicircular halves 21. and 22, which halves 21 and 22 comprise semicircular passages. through the bowl and constitute receptacles in which the lower ends of the hanger bodies, hereinafter described, are inserted. The partition 20, which is made integral with the bowl, is straight. and has flat sides to coincide with the flat sides 'of thehangers which may be removably inserted in the fpassages .21 and 22. The wall 23 of the bowl 19 has formed therein a locator slot 24, opening from the lower side. thereof and having tapered guide surfaces 25 at the entry edges thereof for the purpose of guiding the locator'pin, hereinafter described, into the slot 24. Spaced about theupper periphery of the wall 23 are holddown screw slots 26, there being't-wo of such slots in each side of the bowl 19'. The upper edge of the wall 23 is beveled inwardly, as indicated at 27, so as to provide a guide for the tubing hangers when lowered into the passages 21 and 22. The lower edge of the wall 2 3 is beveled outwardly, as indicated at 28, the bevel 28 coming to rest upon a shoulder 29 formed in the bore 2 of the tubing head, to thereby support the bowl 19 against further downward movement in the head.

A retractable locator pin 30 extends through the flange 3 of the tubing head 1, and is arranged to enter the bore 2 of the tubing head. The locator pin 30 is threadable through a bore in the flange 3, as indicated at 31, and has a head 32 thereon which is arranged to extend into the bore 2. In order to seal about the guide pin against well pressure from below, a resilient packing 33- is provided in the enlarged bore of the passage through the flange 3. Such packing 33 is expanded and sealed by a gland nut 34 threaded into the passage through the flange 3. The gland nut 34 has flat wrench-engaging surfaces 35 thereon and the guide pin 36 has flat wrenchengaging surfaces 36 on the outer end thereof.

A typical tubing hanger used with the bowl 19 is clearly shown in FIGURE II, and indicated generally by the numeral 37.

The hanger 37 includes a hollow body having a flow passage 57 therethrough of substantially the same internal area as the tubing strings 59' and 6G. The outer side of the hanger 37 includes an enlarged semicylindrical surface 33 and a reduced semicylindrical surface 38a, and the other side of the hanger body includes a flat surface 46 terminated at its lower end by a beveled surface 46a.

A packing groove 39 extends about the enlarged semicylindrical surface 38 and the flat surface 46, said packing groove being substantially D-shaped, and is arranged to receive a resilient D-shaped packing ring 55. When two of the hanger bodies 37 are disposed in the tubing head, as shown in FIGURE 1, the packing rings 55 on the respective hanger bodies are in coinciding relationship and such packing rings, being slightly larger in diameter than the groove in which they are disposed, are pressed into sealing engagement with the inner wall of the tubing head and against adjacent surfaces of the inner sides of such sealing rings.

The sealing rings 55 are brought into coinciding relationship when the straight shoulder 44 on the semicylindrical side of the hanger heads comes into abutting relationship with the upwardly facing straight shoulder 48 in the bore 2 of the tubing head 1, thus assuring that the resilient sealing rings 55 are in coinciding relationship when the hangers 37 are landed in the head.

The tubing hanger 37 also includes a reduced cylindrical neck portion 40 having a packing groove 41 formed thereabout. The cylindrical neck portion 44 is arranged to extend into the passages 14 and 15 formed in the sealing flange 4 when the sealing flange is placed thereover, and the resilient 0 ring seals 56 which are disposed in the grooves 41, extend slight-1y outwardly of the grooves and are pressed into sealing engagement with the Walls of the passages 14 and 15.

The cylindrical neck portion 40 of the hanger 47 is interiorly threaded, as indicated at 42, for the purpose of threadedly receiving a running pipe or a conduit which may be attached thereto when the hangers are being positioned in the tubing head. The hanger 37 also includes a flat upper side 43, which prevents upward movement of the hangers when the holddown screws, hereinafter described, *are removed and the adaptor flange 5 is removed, by reason of the engagement of the fiat surface 43 with the lower side of the sealing flange 4.

The straight shoulder 44 arranged about the semicylindrical side of the hanger 37 merges into a tapered shoulder 45, which tapered shoulder 45 provides a guide for the tubing hanger when placed in the head. Each hanger body 37 has a pair of diametrically spaced recesses 47 formed on the reduced semicylindrical side 38a. Such recesses 47 are arranged to receive holddown pins 49 which are threaded through passages in the wall of the tubing head.

The holddown pins 49 include a threaded portion 50 which retractably extends through threaded passages in the wall of the tubing head, and such threaded passages are sealed by resilient packings 51 which are expanded and sealed by threaded packing glands 52. The packing gland 52 includes a wrench-engaging surface 53 and the holddown pin 49 includes wrench-engaging surfaces 54.

The hangers 37 each includes a threaded opening 58 in the lower end thereof to which the tubing strings 59 and 60 may be threadedly engaged prior to setting the hangers 37 in the head.

In assembling the apparatus hereinbefore described in relationship to a well head, the tubing head 1 is secured to the top of the casing by suitable connections (not shown).

The tubing strings 59 and 60 are made up and run into the well, which tubing strings may have gas lift valves and other protuberances thereon. While running the tubing string a suitable blowout preventer (not shown) may be attached to the tubing head 1. The bowl 19 may be placed in the head 1 either before or after running the tubing, but prefer-ably after running the tubing. Prior to placing the bowl 19 in the head, the locator screw 30 is turned inwardly so that the head 32 thereon extends inwardly of the bore 2 of the head. The bowl 19 is then so positioned in the head that the locator slot 24 will pass downwardly over the locator screw 30, thus positioning the bowl 19 in a predetermined position in the head. In such position the holddown slots 26 will coincide with the threaded passages for the holddown screws 49 extending through the wall of the head and with the recesses 47 provided in the walls of the hangers 37, when such hangers are suspended in the head.

The tapered surface 28 on the lower end of the hanger howl 19 is landed on the upwardly facing surface 29' inside the bore 2, and in such position the bowl 19 is ready to receive the hangers 37 so that the holddown screws 49 may be engaged therewith and the seals 55 and 56 are in sealing relationship.

The hangers 37 are then threadedly engaged with the upper ends of the tubing strings 59- and 6t} and each is lowered and seated in a passage 21 or 22 in the hanger bowl 19. The downward movement of the hanger-s 37 iS stopped by the engagement of the straight shoulders 44 with the upwardly facing straight shoulder 48 in the bore 2. At such position the seals 55 are in coinciding relationship and are in sealing position, sealing between the inner sides of the hangers 37 and between the enlarged semicylindrical surface 3'8 and the inner wall of the bore 2.

It will be seen that the bowl 19 is held against rotation by the locator screw 30', so that the hangers 37, which are in engagement with the partition 20, may not rotate within the bore 2. Furthermore, the partition 20, being relatively deep and extending across and in contact with the inner flat surfaces 46 of the hangers 37, eliminates any tendency 'of one of the hangers 37 to tilt or move laterally out of position in the head when one of the hangers is removed.

It will also be seen that when the flanges 4 and 5 have been removed, one of the hangers 37 may be removed without removing the other, thereby permitting one tubing string to be removed without disturbing the other tubing 6 in FIGURES IV, V, and VI. In such modified form the hanger body 37 is identically the same in construction as the hanger body previously described and shown in FIG- URE II, except that the straight shoulder 44 is eliminated and a beveled shoulder 61 is provided about the semicylindrical portion of the hanger.

The modified hanger bowl, indicated generally at 62, includes a cylindrical wall 62a, having an outwardly ex tending annular lip 63 on the upper end thereof. The lip 63 has an external taper 64 thereon and an inside taper 65 thereon. The bowl 62 is guided into two semicylindrical compartments or passages 67 and 68 by -a central partition 66.

A locator slot 69 having guide surfaces 70 at the lower sides thereof, extends upwardly from the lower edge of the wall 62a, said locator slot being arranged to receive the locator screw 30 for positioning the hanger bowl 62 in the head in a predetermined position, as described in connection with the preferred form shown in FIGURES I, II and III.

A plurality of holes 71 are provided through the wall 62a, there being two of such holes spaced peripherally of the wall in each passage 67 and 68. The holes 71 receive the holddown pins 49 which extend therethrough into recesses or a groove in the wall of the hanger body to hold the hangers against upward movement.

In using the modified bowl, as described above, the tubing is run and the bowl and hangers are positioned in the head in the manner hereinbefore described. The bowl 62 is inserted in the head with the locator pin 30 entering the locator slot 69, so that the holes 71 in the wall 62a are aligned with the passages in the head for the holddown screws 49. Such holes 71 are also aligned with the recesses 47 which receive the holddown screws 49. When the bowl 62 is positioned in the head, the externally tapered shoulder 64 thereon is landed on the upwardly facing complementary shoulder 72 in the head, and when the hangers are suspended in the head, external shoulders 61 thereon are landed on the upwardly facing shoulder 65 on the upper edge of the bowl 62. In such position the packing rings 55 coincide and provide a seal between the respective hangers and between the hangers and the head.

In employing the modified bowl, as described, each hanger and tubing string suspended thereto may be removed without disturbing or removing the other hanger, and without the danger of such other hanger tilting or moving laterally or rotating about the head, and sufficient space is provided through each of the passages 67 and 68 to permit a tubing string to be run therethrough, having gas lift valves or other attachments on the outer sides thereof.

- .A still further modification providing a transverse partition in the head for supporting the hangers against lateral movement when one is removed is shown in FIG- URES VII, VIII and IX.

string. Furthermore, sufficient space is provided in each of the passages 21 and 22 in the bowl 19 to permit gas lift valves and other attachments on the outer surfaces of the tubing string to be run into the wall or removed therefrom without removing the other hanger body and the other tubing string. This purpose is accomplished and at the same time a means for positively holding the hanger body against lateral movement is provided when the other hanger body is removed.

A modified form of hanger bowl and hanger is shown In such modification, the partition is indicated generally at 73. Such partition 73 includes substantially wedgeshaped outer ends 74 which have outwardly tapered surfaces 75 on each side thereof. The wedge-shaped portions 74 are joined by an integral relatively narrow straight central section 76. Each outer end of the partition 73 includes a locator slot 77 extending upwardly from the lower edge thereof and having tapered guide surfaces 77 on each side of the lower edge thereof. Each end of the partition 73 has formed onvthe upper side thereof a shoulder 79 which is tapered on its lower edge, as indicated at 79a, for the purpose hereinafter mentioned.

Modified hanger bodies, indicated generally at 80, are provided for use with the partition 73. Each modified hanger body 80 includes an enlarged semicy-lindrical side 81 and a flat inner side 81a on such enlarged section, about which is formed a packing groove 82. D-shaped sealing rings 83 are arranged to be positioned in the groove 82 and to extend slightly outwardly therefrom so that they are compressed when placed in the tubing head, as shown in FIGURE VH, to form a seal between the respectivehangers and the wall of the tubing head;

- Each hanger body 80 also includes a reduced semicylindrical side 84 having a relatively wide groove 85 thereabout. Theupper edge of the said grooves 85 is terminated by an enlarged tapered shoulder 86, which is arranged to come to rest on an upwardly facing tapered shoulder 87 in the tubing head 1, to thereby suspend the hanger-bodies 80 within the tubing head. y

The lower portion of each hanger body 80 also includes a side having a flat portion 88 which merges with tapered sides 89. The fiat portion 88 and the tapered sides 89 coincide with the tapered surfaces 75: and 76 on each side of the partition 73.

Each hanger body 80 also includes a reduced upper cylindrical portion 90' which is interiorly threaded, as indicated at 91, and has an annular packing groove 92 thereabout arranged to receive the ring packings 93 to provide a seal between the passages through the sealing flange 4 and the cylindrical portion 90.

Locator pins 94 are threadedly engaged through the wall' of the head 1 on opposite sides thereof, said locator pins having that wrench-engaging surfaces on the outer end thereof. Such locator pins 94 have a threaded portion 96 extending through passages through the wall of the tubing head 1, and the end'97 of the locato'r pins are arranged to extend into the bore of the head l and to slidably engage in the guide slots 77in the endsof the partition 73. The end of the locator pin 94 preferably has flat sides 98 thereon, so that after being inserted in the groove 77, it may not be retraced by rotation. A resilient seal 100 which is compressed by a packing gland 99, is provided about each locator pin 94 to seal the passage through the head through which the locator pin extends.

In placing the partition 73' in the head, the locator pins 94 are first turned inwardly so that the inner ends thereof extend inwardly of the bore 2. The partition is then inserted in the head with the locator slots 77 sliding over the pins at opposite ends and is landed on the shoulder 87 in the tubing head bore. The tubing is then run in the usual manner and the hanger bodies are attached to the upper ends of the tubing strings and the hanger bodies are landed in the head on the shoulder 87 on opposite sides of the partition 73. The partition holds the hanger bodies against lateral tilting and rotational movement, the same as-the partition in the bowls hereinbefore described. The holddown pins 49 extend into the grooves 85 and prevent the upward movement of the hanger bodies by reason of pressure exerted from below. a I

As in the other forms described, either of the-hanger bodies may be removed without the danger of the other tiltingor rotating out of position, and suflicient space is provided on each side of the partition to permit a tubing string, having auxiliary equipment mounted on the outer sides'thercof, without removing the other tubing string or the tubing hanger attached thereto.

The invention has been described in connection with complementary hangers for suspending two strings of tubing, but such was merelyillustrative, and it will be readily apparent that additional strings of tubing could be suspended by such multiple hanger arrangement by simply dividing the bowl 19 or 62 into as many passages of complementary shape as there are hangers to be suspended therein and making the hangers of like complementary shapes;

It will be understood that other and further forms of the invention may be made without departure from the'spirit and scope of the appended claims.

I claim: I

I. In a device of the class described, a tubing head having a central bore therethrough; an annular shoulder in the bore; a hollow cylindrical body slidably disposed in the bore and arranged to rest on the said shoulder; a transverse partition in the body dividing same into two equal semicircular passages; a locator pin arranged to project from the inner wall of the bore; a locator slot in the wall of the body arranged to slide over the locator pin; a pair of hollow hanger bodies having lower portions slidable into the passages through the body and being of such sizeand shape as to fill said passage; said hangers having abutting inner faces and outer semicircular faces to fit the bore above the body; shoulder means on the semicircular faces; shoulder means in the bore above the body arranged to receive and support shoulder means on the hanger bodies; seal means above the abutting shoulders arranged between the abutting faces of the hanger bodies and the semicircular faces of the hangers and inner wall of the bore; a plurality of recesses in the outer sides of the hanger bodies, passages through the wall of the body aligned with the recesses, and retractable holddown screws extending through the wall of the head and adapted to extend through the passages in the wall of the body, and engageable with aligned recesses in the hanger bodies to hold the hanger bodies against upward movement.

2. The combination called for in claim 1 wherein the engaging shoulders in the bore and about the hanger bodies above the body include an outer straight portion.

3. The combination called for in claim 1 with the addition of a reduced cylindrical portion at the upper end of each of the hanger bodies, a sealing flange, having passages therethrough arranged to receive the cylindrical portions; seal means between the passages and the cylindrical portions; an adaptor flange portion above the sealing flange and having passages therethrough communicating with the hollow portion of the hanger bodies; seal means between the tubing head, sealing flange and adaptor flange; and means to secure the said flanges together.

4. In a device of the class described, a tubing head having a central bore therethrough; an annular shoulder in the bore; a hollow cylindrical body slidably disposed in the bore and arranged to rest on the said shoulder; transverse partition means in the body dividing same into equal passages; a locator pin arranged to project from the inner wall of the bore; a locator slot in the wall of the body arranged to slide over the locator pin; a plurality of hollow hanger bodies having lower portions slidable into the passages through the body, and being of such size and shape as to fill said passages; said hangers having abutting inner faces and outer arcuate faces to fit the bore above the body; shoulder means on the arcuate faces; shoulder means in the bore above the body arranged to receive and support shoulder means on the hanger bodies; seal means above the abutting shoulders arranged between the abutting faces of the hanger bodies and the arcuate faces of the hangers and inner wall of the bore; a plurality of recesses in the outer sides of the hanger bodies; passages through the wall of the body aligned with the recesses; retractable hold-down screws extending through the wall of the head and adapted to extend through the passages in the wall of the body, and engageable with aligned recesses in the hanger bodies to hold the hanger bodies against upward movement.

References Cited in the file of this patent UNITED STATES PATENTS 64,905 Porter May 21, 1867 1,669,333 Gerber May 8, 1928 2,335,355 Penick -e Nov. 30, 1943 2,354,929" Re'ctor- Aug. 1, 1944 .;2, 39 0,393 Rubly Dec. 4, 1945 [2,507,246 Davidson May 9, 1950 v..'Z, l,235 Watts June 19, 1956 1,766,829 Watts Oct. 16, 1956 2,794,505 Allen June 4, 1957 12,939,727 Allen June 7, 1960 FOREIGN PATENTS 783,396 Great Britain Sept. 25,1957 

1. IN A DEVICE OF THE CLASS DESCRIBED, A TUBING HEAD HAVING A CENTRAL BORE THERETHROUGH; AN ANNULAR SHOULDER IN THE BORE; A HOLLOW CYLINDRICAL BODY SLIDABLY DISPOSED IN THE BORE AND ARRANGED TO REST ON THE SAID SHOULDER; A TRANSVERSE PARTITION IN THE BODY DIVIDING SAME INTO TWO EQUAL SEMICIRCULAR PASSAGES; A LOCATOR PIN ARRANGED TO PROJECT FROM THE INNER WALL OF THE BORE; A LOCATOR SLOT IN THE WALL OF THE BODY ARRANGED TO SLIDE OVER THE LOCATOR PIN; A PAIR OF HOLLOW HANGER BODIES HAVING LOWER PORTIONS SLIDABLE INTO THE PASSAGES THROUGH THE BODY AND BEING OF SUCH SIZE AND SHAPE AS TO FILL SAID PASSAGE; SAID HANGERS HAVING ABUTTING INNER FACES AND OUTER SEMICIRCULAR FACES TO FIT THE BORE ABOVE THE BODY; SHOULDER MEANS ON THE SEMICIRCULAR FACES; SHOULDER MEANS IN THE BORE ABOVE THE BODY ARRANGED TO RECEIVE AND SUPPORT SHOULDER MEANS ON THE HANGER BODIES; SEAL MEANS ABOVE THE ABUTTING SHOULDERS ARRANGED BETWEEN THE ABUTTING FACES OF THE HANGER BODIES AND THE SEMICIRCULAR FACES OF THE HANGERS AND INNER WALL OF THE BORE; A PLURALITY OF RECESSES IN THE OUTER SIDES OF THE HANGER BODIES, PASSAGES THROUGH THE WALL OF THE BODY ALIGNED WITH THE RECESSES, AND RETRACTABLE HOLDDOWN SCREWS EXTENDING THROUGH THE WALL OF THE HEAD AND ADAPTED TO EXTEND THROUGH THE PASSAGES IN THE WALL OF THE BODY, AND ENGAGEABLE WITH ALIGNED RECESSES IN THE HANGER BODIES TO HOLD THE HANGER BODIES AGAINST UPWARD MOVEMENT. 